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| Effects of elevated atmospheric CO2 and O3 on soil enzyme activities and microbial biomass |
| Received:March 28, 2016 |
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| KeyWord:open top chamber(OTC);ozone(O3);carbon dioxide(CO2);soil physicochemical properties;soil microbial biomass;soil enzymes |
| Author Name | Affiliation | E-mail | | SHI Cui-e | School of Biological Engineering, Huainan Normal University, Huainan 232038, China | | | AI Fu-xun | State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing 210023, China | | | WANG Cheng-run | School of Biological Engineering, Huainan Normal University, Huainan 232038, China | chengrunwang@163.com | | YAN Shou-bao | School of Biological Engineering, Huainan Normal University, Huainan 232038, China | | | CHE Yun-cheng | School of Biological Engineering, Huainan Normal University, Huainan 232038, China | |
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| Abstract: |
| Pot cultivation of green vegetables was performed in Open Top Chamber(OTC) platform to investigate the effects of elevated [CO2], [O3] or [CO2+O3] on soil physicochemical properties, microbial biomass and soil enzyme activities. And thus to explore the ecological risk of elevated atmospheric CO2 or/and O3 on soil microbial systems in the future. The results showed that the elevated[CO2] increased the contents of dissolved organic carbon(DOC), dissolved organic nitrogen(DON), total phosphorus(TP), total carbon(TC), ammonium nitrogen(AN), nitric nitrogen(NN), and soil water content(SWC) to some extent. And thus differentially promoted the contents of microbial biomass carbon(MBC), microbial biomass nitrogen(MBN) as well as activities of soil protease(PRA), sucrase(SA), urease(UA), phenol oxidase(POA), acid phosphatase(APA) and neutral phosphatase(NPA) in the soils. Contrarily, the elevated [O3] reduced the contents of DOC, TP, TK, TC, TN, AN, NN, SWC, MBC and MBN to some extent, increased ratios of MBC/MBN, and contributed to the decreased activities of PRA, SA, UA, POA, APA and NPA to some extent. However, to some extent, [CO2+O3] alleviated the inhibition of the soil microbial biomass and soil enzyme activities by the elevation of [O3], and also limited the activation by [CO2]. Meanwhile, the elevation of [CO2], [O3] or [CO2+O3] did not change the tendency of the soil physicochemical properties, microbial biomass and enzyme activities. Therefore, the unusual alteration of soil microbial biomass and soil enzyme activities can be used for assessment of the effects of elevated atmospheric CO2 or/and O3 on soil microbial environment of vegetable fields in the future. |
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